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[2.7]bpo-36807: When saving a file in IDLE, call flush and fsync (GH-13102) (GH-13293)

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Original file line number	Diff line number	Diff line change
`@@ -383,6 +383,8 @@ def writefile(self, filename):`
`383`	`383`	`try:`
`384`	`384`	`withopen(filename,"wb")asf:`
`385`	`385`	`f.write(chars)`
	`386`	`+f.flush()`
	`387`	`+os.fsync(f.fileno())`
`386`	`388`	`returnTrue`
`387`	`389`	`exceptIOErrorasmsg:`
`388`	`390`	`tkMessageBox.showerror("I/O Error",str(msg),`

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+When saving a file, call os.fsync() so bits are flushed to e.g. USB drive.`

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